Integration Engineering / API Design
API Design & Development
An API is a promise to every app, partner, and developer that uses it. We design and build REST APIs with clear resources, consistent errors, proper authentication, pagination, and documentation — so they're easy to adopt and safe to evolve.
This Is For You If...
You're building a backend API for your web or mobile app
You're opening a public or partner API and want it right the first time
Your current API is inconsistent, poorly documented, and hard to use
Clients break whenever the API changes
Which Area Matches Your Need?
Ask Yourself | Points Toward |
Are you designing a new API? | API Design & Specification |
Is an existing API inconsistent or hard to use? | API Review & Redesign |
Do you need secure access for partners or customers? | Authentication & Rate Limiting |
Do developers struggle to adopt it? | Documentation & Developer Experience |
API Services We Offer
API Design & Specification
Resources, endpoints, request and response formats, and error models defined in an OpenAPI specification before code is written.
API Review & Redesign
We review naming, status codes, pagination, filtering, and error handling, and plan improvements without breaking existing clients.
Authentication & Rate Limiting
API keys, OAuth 2.0, JWT, scopes, and per-client rate limits for safe external access.
Documentation & Developer Experience
Interactive docs, examples, SDKs, and sandbox environments that shorten time to first successful call.
What We Need From You
What to Share | Why It Helps |
Who will use the API | Internal, partner, and public APIs need different design |
The main use cases | Resources follow what clients actually need |
Existing API or codebase | Lets us improve rather than restart |
Stack and hosting | Keeps the build compatible |
Common Mistakes to Avoid
Instinct | Why It Doesn't Help | Do This Instead |
Exposing database tables as endpoints | Couples clients to your internal structure | Design resources around client use cases |
Inconsistent errors | Every client handles failures differently | Use one error format and correct status codes |
No pagination | Responses grow until they time out | Paginate list endpoints from day one |
No versioning plan | Changes break clients | Plan API Versioning up front |
How It Works
1. Gather use cases
Who calls the API and why
2. Write the spec
OpenAPI design reviewed with you
3. Build
Endpoints, auth, validation, and tests
4. Document
Interactive docs and examples
5. Hand over
Code, spec, and guidelines for future endpoints
Why Codersarts
We design the contract before the code, so your API is consistent from the first endpoint and your team has guidelines to keep it that way.
Turnaround Time
An API design and specification is typically ready within a few days. Build time depends on the number of endpoints and integrations.
FAQ
REST or GraphQL?
REST suits most public and partner APIs; GraphQL suits complex, client-driven data needs.
Which frameworks do you use?
Node.js, Python (FastAPI, Django), Java (Spring), Go, and .NET, depending on your stack.
Can you secure an existing API?
Yes — authentication, authorization, and rate limiting can be added to running APIs.
Is our project kept confidential?
Yes. Your data, code, and results stay confidential, and an NDA is available on request.
Related Services
Building or Fixing an API?
Get a design developers can understand and rely on.